outlook MAPI connector

[kardiac]

Hello,

    I have a client wanting extending mail services to all this users. 
He has a exchange server but don't want purchase more licence mainly 
because  he want just provide mail functionality.  I have provided a 
Postfix/cyrus-imap  solution. But he has some users on Mac OS 9 and he 
don't want change their mail client which is outlook express. This  
mail  client  use  only MAPI protocol. So my question is someone know a 
good MAPI/outlook connector preferably on server side and where i can 
specify imap server ?

Thanks by adance,

Kardiac
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